lüˈkäfəˌnīt noun
also leu·co·phane ˈlükəˌfān
( -s )
Etymology: leucophanite from leucophane (from Swedish leukophan, from leuk- leuc- + -phan -phane) + -ite
: a mineral (Na, Ca) 2 BeSi 2 (O, F, OH) 7 consisting of a beryllium sodium calcium silicate with fluorine occurring in glassy greenish tabular crystals